I saw in another app which is has tab menu, When I look for in Web appbuilder, I unable to find that option. Pls refer the screen shot.
How it can be done in web app builder?
Refer to the help docs:
Create a new theme—Web AppBuilder for ArcGIS (Developer Edition) | ArcGIS for Developers
That is a custom developed theme or widget. It is not a OTB option that you can choose.
How to create an custom theme and upload in web app builder?
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